It looks like the script is there to block phantomjs based bots (which can evaluate JS). It seems to check for the global properties mentioned in this article:

It looks like the script is there to block phantomjs based bots (which can evaluate JS). It seems to check for the global properties mentioned in this article: https://blog.shapesecurity.com/2015/01/22/detecting-phantomjs-based-visitors/ https://blog.shapesecurity.com/2015/01/22/detecting-phantomj... If the properties are defined, it doesn't do anything, otherwise it reloads the page. It is obfuscated but that seems to be what's going on anyway.